Abstract
We have analysed the K− d-induced reactions both in flight and for K− capture from rest. The two-body hadronic interactions have been adopted in the form of a rank-one separable potential whose parameters have been adjusted to fit two-body scattering data. The in-flight reaction cross-sections are obtained from the distorted-wave impulse approximation whereas the at-rest capture rates are calculated from the appropriate multichannel Faddeev formalism. The calculated spectra are in good quantitative agreement with the data. The prominent peak at 2130 MeV in the lambdaproton effective mass distribution is interpreted as a strong cusp effect which requires the existence of a pole in the hyperon-nucleon scattering amplitude close to sigma-nucleon threshold. The excitation at 2140 MeV can be reproduced by assuming a narrowp-wave hyperon-nucleon resonance similar to that predicted by quark model asq2-q4,L=1 orbital excitation.
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